SpringCloud之Feign负载均衡（四）

^整合Feign

pom.xml

       
            org.springframework.cloud
            spring-cloud-starter-openfeign
        

 

启动类

1 @SpringBootApplication
2 @EnableFeignClients
3 public class OrderServiceApplication {
4 ​
5     public static void main(String[] args) {
6         SpringApplication.run(OrderServiceApplication.class, args);
7     }
8 }

 

Web层

 1 @RestController
 2 @RequestMapping("/api/v1/order")
 3 public class OrderController {
 4 ​
 5 ​
 6     @Autowired(required = false)
 7     private ProductOrderServiceImpl productOrderService;
 8 ​
 9 ​
10     @RequestMapping("/save")
11     public Object save(@RequestParam("user_id")int userId, @RequestParam("product_id") int productId){
12 ​
13         return productOrderService.save(userId, productId);
14     }
15 ​
16 }

​

Bo类

/**
 * 商品订单实体类
 */
public class ProductOrder implements Serializable {
​
​
    private int id;
​
    /**
     * 商品名称
     */
    private String productName;
​
    /**
     * 订单号
     */
    private  String tradeNo;
​
    /**
     * 价格,分
     */
    private int price;
​
​
    private Date createTime;
​
​
    private int userId;
​
    private String userName;
​
​
    public int getUserId() {
        return userId;
    }
​
    public void setUserId(int userId) {
        this.userId = userId;
    }
​
    public String getUserName() {
        return userName;
    }
​
    public void setUserName(String userName) {
        this.userName = userName;
    }
​
    public int getId() {
        return id;
    }
​
    public void setId(int id) {
        this.id = id;
    }
​
    public String getProductName() {
        return productName;
    }
​
    public void setProductName(String productName) {
        this.productName = productName;
    }
​
    public String getTradeNo() {
        return tradeNo;
    }
​
    public void setTradeNo(String tradeNo) {
        this.tradeNo = tradeNo;
    }
​
    public int getPrice() {
        return price;
    }
​
    public void setPrice(int price) {
        this.price = price;
    }
​
    public Date getCreateTime() {
        return createTime;
    }
​
    public void setCreateTime(Date createTime) {
        this.createTime = createTime;
    }
}

View Code

 

Fegin客户端

 1 /**
 2  * 商品服务客户端
 3  */
 4 @FeignClient(name = "product-service")
 5 public interface ProductClient {
 6 ​
 7 ​
 8     @GetMapping("/api/v1/product/find")
 9     String findById(@RequestParam(value = "id") int id);
10 ​
11 ​
12 }
13 ​

 

Service层

 1 @Service
 2 public class ProductOrderServiceImpl {
 3 ​
 4 ​
 5     @Autowired(required = false)
 6     private ProductClient productClient;
 7 ​
 8     public ProductOrder save(int userId, int productId) {
 9 ​
10         String response = productClient.findById(productId);
11 ​
12         JsonNode jsonNode = JsonUtils.str2JsonNode(response);
13 ​
14         ProductOrder productOrder = new ProductOrder();
15         productOrder.setCreateTime(new Date());
16         productOrder.setUserId(userId);
17         productOrder.setTradeNo(UUID.randomUUID().toString());
18         productOrder.setProductName(jsonNode.get("name").toString());
19         productOrder.setPrice(Integer.parseInt(jsonNode.get("price").toString()));
20         return productOrder;
21     }
22 ​
23 }
24 ​

 

Util类

 1 /**
 2  * json工具类
 3  */
 4 public class JsonUtils {
 5 ​
 6     private static final ObjectMapper objectMappper = new ObjectMapper();
 7 ​
 8     /**
 9      * json字符串转JsonNode对象的方法
10      */
11     public static JsonNode str2JsonNode(String str){
12         try {
13             return  objectMappper.readTree(str);
14         } catch (IOException e) {
15             return null;
16         }
17     }
18 ​
19 ​
20 }

 

注：eureka-server和prduct-service参考前面的，直接启动

测试：

http://localhost:8781/api/v1/order/save?user_id=1&product_id=1

{
  "id": 0,
  "productName": "\"iphonex data from port=8771\"",
  "tradeNo": "6b9b6530-a1f8-42d8-9a17-1beda890a91e",
  "price": 9999,
  "createTime": "2019-10-17T05:58:09.717+0000",
  "userId": 1,
  "userName": null
}
{
  "id": 0,
  "productName": "\"iphonex data from port=8773\"",
  "tradeNo": "6b668929-4280-44cc-9c7c-401ca85e6550",
  "price": 9999,
  "createTime": "2019-10-17T06:32:16.971+0000",
  "userId": 1,
  "userName": null
}
{
  "id": 0,
  "productName": "\"iphonex data from port=8772\"",
  "tradeNo": "3e1a4887-98e8-4910-93fb-4758c508c643",
  "price": 9999,
  "createTime": "2019-10-17T06:32:32.355+0000",
  "userId": 1,
  "userName": null
}